sedimentary
Banded Jasper
Silicon dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale), Color: Brown, tan, cream, and reddish-brown bands, Luster: Dull to waxy, Crystal structure: Microcrystalline (Trigonal), Opaque with distinct parallel layers
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brown, tan, cream, and reddish-brown bands, Luster: Dull to waxy, Crystal structure: Microcrystalline (Trigonal), Opaque with distinct parallel layers
Formation & geological history
Formed from the deposition of silica-rich sediments and volcanic ash that has undergone silicification over millions of years. The banding results from rhythmic precipitation of iron oxides and other minerals during formation.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and tumbled stones. Also used as decorative landscaping stones and by collectors for its unique aesthetic patterns.
Geological facts
The term jasper comes from the Greek word 'iaspis', meaning spotted stone. Banded varieties are often called 'picture jasper' if the lines resemble landscapes, particularly common in the Pacific Northwest of the USA.
Field identification & locations
Identify by its hardness (will scratch glass), smooth grain, and lack of crystal facets. It is commonly found in riverbeds and coastal areas as water-worn pebbles. Look for it in high-silica volcanic regions.
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